WIMS> CIM> Another anomaly in CIM_Printer. Let's not fix this one.

WIMS> CIM> Another anomaly in CIM_Printer. Let's not fix this one.

WIMS> CIM> Another anomaly in CIM_Printer. Let's not fix this one.

Richard_Landau at Dell.com Richard_Landau at Dell.com
Mon Mar 9 13:02:29 EDT 2009


Another, um, anomaly in CIM_Printer.  Not a bug.  Sort of.  Maybe we did
this deliberately, since it appears to make sense, but we ought at least
to say something to warn poor, naive coders.  

The enum list of property CIM_Printer.LanguagesSupported does not quite
match that of prtInterpreterLangFamily, which makes a direct mapping
impossible.  Note that after value 6(PostScript), the numbers do not
match.  Actually, the numbers 7 thru 41 are all shifted up by one
because we moved number 42 to number 7 in the enum list and shifted all
the others up to make room.  Since 42 was then missing, the numbers
after 43 align again.  Tricky, tricky.  

I will paint over this nicely in the prototype.  I don't think we ought
to fix it.  But we ought to document it.  Who would read a 3-page-long
enum list if he didn't have to?  

CIM_Printer.mof says (highly abridged excerpts of all docs)

       ValueMap { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", 
          "11", "12", "13", "14", "15", "16", "17", "18", "19", 
	. . . 
       Values { "Other", "Unknown", "PCL", "HPGL", "PJL", "PS", 
          "PSPrinter", "IPDS", "PPDS", 
         // 10
          "EscapeP", 
          "Epson", "DDIF", "Interpress", "ISO6429", "Line Data",
	. . . 

But RFC3805 says

PrtInterpreterLangFamilyTC ::= TEXTUAL-CONVENTION
    SYNTAX    INTEGER {
        other(1),
        unknown(2),          -- Not in RFC 1759
        langPCL(3),          -- PCL.  Starting with PCL version 5,
        langHPGL(4),         -- Hewlett-Packard Graphics Language.
        langPJL(5),          -- Peripheral Job Language.  Appears in
        langPS(6),           -- PostScript (tm) Language
        langIPDS(7),         -- Intelligent Printer Data Stream
        langPPDS(8),         -- IBM Personal Printer Data Stream.
        langEscapeP(9),      -- Epson Corp.
        langEpson(10),
        langDDIF(11),        -- Digital Document Interchange Format
        langInterpress(12),
        langISO6429(13),     -- ISO 6429.  Control functions for
        langLineData(14),    -- line-data:  Lines of data as
        langMODCA(15),       -- Mixed Object Document Content

And RFC1759 says -- now watch closely, the fingers will never leave the
hands --

prtInterpreterLangFamily OBJECT-TYPE
    -- This value is a type 2 enumeration
    SYNTAX     INTEGER {
          other(1),
          langPCL(3),        -- PCL.  Starting with PCL version 5,
          langHPGL(4),       -- Hewlett-Packard Graphics Language.
          langPJL(5),        -- Peripheral Job Language. Appears in the
          langPS(6),         -- PostScript Language (tm)
          langPSPrinter(42), -- The PostScript Language used for
          langIPDS(7),       -- Intelligent Printer Data Stream
          langPPDS(8),       -- IBM Personal Printer Data Stream.
          langEscapeP(9),
          langEpson(10),
          langDDIF(11),      -- Digital Document Interchange Format
          langInterpress(12),
          langISO6429(13),   -- ISO 6429.  Control functions for Coded
          langLineData(14),  -- line-data:  Lines of data as separate
          langMODCA(15),     -- Mixed Object Document Content
Architecture

See that tricky out-of-order sequence there, 5, 6, 42, 7, 8, . . . .
Once again proving the wisdom and foresight of The Hitchhiker's Guide to
the Galaxy that 42 is more important than it appears at first.  

I caught this only because one of the languages in the (fake) printer I
test with most of the time is "Automatic," the value of which changed
from 37 to 38 as a result of this shift.  

rick
---------------------- 
Richard_Landau(at)dell(dot)com, Stds & System Mgt Architecture, CTO
Office 
+1-512-728-9023, One Dell Way, RR5-3, MS RR5-32, Round Rock, TX 78682 



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.pwg.org/archives/wims/attachments/20090309/f99468a6/attachment.html


More information about the Wims mailing list